Ha! That may be one of the best technical comments ever, JC-Ski. I could see multi-page threads arguing over whether or not a skier's stance "brooked repudiation." Excellent!
A lot of folks have made attempts to break down skiing (and other endeavors) into different physical and mental components - Weems' Sports Diamond is one great, well thought out example offered as a learning framework. Along somewhat similar yet different lines I've come to see functioning effectively/successfully as a product of three basic things which can interact in interesting ways...
Ability could be thought of as the sum of applied skill and physical capability, (including strength and fitness). Its components are largely physical in nature, but it can be buoyed or dragged down by the other two components.
Confidence is a feeling, which can exist without experience, or even in the presence of negative experience, but is definitely bolstered by positive experience.
Determination is a mindset, the foundation of which can be heart, and/or balls, and/or doggedness. Belief/faith can play a big part too. It too can be bolstered by positive experience, but can exist without experience, and critically can help overcome negative experience.
When there is a Holy Trinity-like confluence of these three components you get someone like a Roger Federer. I use Federer as an example not only because I really like and admire him as a player, and think in his prime he played the most beautiful and effective tennis ever, but because at 32 he is now old for a tennis player, definitely past his prime, and struggling to continue to be competitive at the highest level. Instead of the three components summing as a force that created a positive wave he stylishly surfed for years now he's losing more and more and you can can see them combining in a very negative way. And the other players look at him now and think "Your Kung Fu is weak, old man!", and their own components are spiked upward by that, and they go out and beat him. The whole thing for Fed is now a downward spiral. Can he halt/reverse it? The odds (and historical record) are against it, but if he is able somehow to make a comeback and prevail again I believe it will be because he will change things he can control - fitness, and more importantly, determination. The tennis skills don't really go away. The movement (physical capability) does, but can to some degree, for some time, be offset by fitness. Determination can potentially overcome everything - it too can move mountains! (Fed's bête noire Nadal is the GOAT when it comes to determination, as far as I'm concerned.)
Back to skiing, it might be interesting to think about Lindsey Vonn and what she's going through at this time in terms of ability, confidence and determination. ( I wouldn't bet against her! ;-)
And back on the thread topic, it might be interesting to consider the skier/skiing shown in the first video of this post in the same way. I would posit that with everything else he has going for him Defago, given more time on the same skis on the same terrain, would make adjustments in his technique and get comfortable, and the experience would bring his confidence way up, and his skiing would follow. I mean, f**k, that is some serious terrain, with serious consequences.
For convenience here's the vid...
Lastly, I purposely didn't bring skis into the conversation earlier, as I just wanted to discuss some concepts that had been rolling around in my head for a while. However I would not deny that skis can have an impact on ability, and confidence, regardless of which of those is the chicken and which the egg.
But with enough determination ... one can brook no repudiation! ;-)
**Full disclosure: Many, many, many moons ago I was lying in bed next to my then girlfriend who was reading some kind of bodice ripper. She came across a passage - "his eyes brooked no repudiation" - and asked me what it meant. I told her it meant he would refuse to take no for an answer. Funny how things can stick in your mind.